Dowel pin



Patented May 14, 1935 m mention` Y I .,DowELKVPIN y l Rudolf Krfiansky,Montreal, Quebec,- Canada Application April 9, 1934,` serialNo. 719,713

claims. Y (ci. 2014,92)

. My invention relates'totheconnecting of toy wooden .blocks or-woodenblocks of any size, as the case may be,` and the objects of myinare;primarily,` to enable children to 5 make use of wooden blocks inmultiple ways,

with straight outside being able to assemble and dissemble easilyvarious structures and models built up from the said blocks; secondly,to supply a new means of connecting any size of wooden blocks or blocksmade from other material which are destined to be joined firmly togethereither temporarily or permanently as the said dowel pins' could be madein any length and in any width to suit the size of these blocks. 'Ihedowel pins are composed of two pieces and are made in two slightlydifferent forms: one with straight outside surface and the other withcurved outside surface, both working the same way and serving identicalpurposes as described below:

Figure 1 shows the side view of the dowel pin surface.

Figure 2 shows the side View of the dowel pin with curved outsidesurface. Figure 3 shows section A-A of the dowel pin with the straightoutside surface.

Figure 4 shows the end View of the dowel pins.

`Figure 5 shows thesection B B of the dowel pin with the curved outsidesurface. Figure 6 shows dowel pins inserted in block with tapered holesand in position before blocks are joined.

Figure 7 shows the two blocks joined together with dowel pins inposition.

Figure 8 shows the dowel pins used in block with straight holes and inposition before blocks are joined.

Figure 9 shows the two blocks joined together with dowel pins inposition.

Figure 10 shows dowel pin in combination with ordinary straight circularpin inserted in block with straight hole and in position before blocksare joined. 'Ihe said ordinary straight circular pin is not a part of myinvention. two blocks joined together ordinary straight circular Figure11 shows the `with a dowel pin and pin` in position.

' Referring to the drawing:

I 'Ihe dowel pins I and 2 are made of half round wooden pegs or anyotherresilient material.

l towards each end 6 of dowel pins I The contactingv or inside surfaceand Figure 2) of both dowel pins `flat and recede from the axis at 5(Figure 1 I and 2 are the centre I and 2 so The centre pins I and as toform almost a blunt point. of the said inside surface 5 of dowel 2 formsa short straight base 1. surface 3 of both dowel pins I and 2 aresemicylindrical and` while the said outside surface 8 of `dowel pintis/straight, the outside surface 8 of dowel pin 2 is curved 9 in thecentre. The ends IG of both dowel pins are bevelled so as to form almosta blunt point, thus enabling the insertion of the dowel pins, when usedin combination, in the bores of blocks as shown by Figure 6 and Figure8.

Both dowel tion 4of two (Figure 6 and Figure 8). each kind has to beused in connection ferent bores. y

`The dowel pins I with straight outside surface 8 are used in connectionwith tapered bores I2 (Figure 6). These dowel pins I in combination oftwo (Figure 6) are inserted in one of the tapered bores I2, the ends 6of the said dowel pins touching' the back I3 (Figure 6) of that bore I2.The disengaged ends 6 of dowel pins I are then inserted in the bore I 2aof the opposite block Ma. The dowel pins I being made of a resilientmaterialand are originally a little wider at point I5 (Figure l) whenused in combination of two than However, with dif- `the diameterof thetapered bores at point IE of blocks Ui and Ma, said diameter at point I6being about half waydown bores I 2 and I 2a-are by insertion andprogressive pressure on the two blocks I li and I 4a to be connected,reduced to a smaller diameter than the said bores at point I6, theircontractibility cooperating with the said tw-o blocks, holding themtightly together as shown byFigure 7.

The dowel pins 2 with curved outside surface 9 are used in connectionwith straight bores II and Illav (Figure 8). These dowel pins 2 incombination of two are inserted in bores I1, the two ends 6 of the saiddowel pins 2 touching lthe back I3 of the bore Il. The disengaged ends 6of the dowel pins 2 are then inserted into the bore I1a of block Ia. Thedowel pins 2 being made of resilient materialand are originally a littlewider at point I5 (Figure 2) when used in combination of two than thediameter of the said straight bores Il' and I la-are by insertion andAThe outside increasing the force of the dowel pins at point I5 (Figure 7and Figure 9) where they are in contact with the interior side of thebores of the blocks; secondly enabling the connected blocks to be easilyseparated. and the said dowel pins equally easily withdrawn and handledwith facility even by Very small children. This method will also add tothe resiliency of both dowel pins I and 2.

Because the dowel pins accommodate themselves to the diameter of thebores, which are of lesser diameter than-the dowel pins in combinationof two at point I5, the dowel pins in the bores when the blocks arejoined are slightly bent at point 2 I.

Referring to Figures 10 and 11 pins I and 2 could be used in combinationwith ordinary straight circular pin 20 (Figure 1'0 and Figure 11) whichis in no Way a part of my invention and the method of working is similarto the others *already described.

I claim.:

l. A dowel pin comprising two similar semicylindrical parts, havingtheir inner-contacting surfaces receding from the middle towards theirends.

2. A dowel pin comprising two similar semicylindrical parts, havingtheir innercontacting surfaces receding from the middle towards theirends and their outer surfaces bevelled at their ends.

3. A dowel pin comprising two similar semicylindrical parts, havingtheir inner-contacting surfaces receding from the middle towards theirends and their outer surfaces curved inwardly in the middle and bevelledat the ends.

-4. In a dowel pin, a semi-cylindrical member having its inner surfacereceding from the middle towards the ends and its outer surface bevelledat the ends adapted to cooperate with a plane semi-cylindrical member.

5. .In a dowel pin, a semi-cylindrical member having its inner surfacereceding from the middle towards the ends and its outer surface inwardlycurved at the middle and bevelled at the ends, adapted to cooperate witha plane .semi-cylindrical member.

RUDOLF KRANSKY.

